随着地铁的长期运行,杂散电流对钢轨和钢轨附近的管线造成严重腐蚀,同时钢轨电位异常增高造成人身触电的问题日益凸显出来。文章建立了地铁回流系统的离散模型,并在MATLAB中对其进行了仿真,得到了地铁直流杂散电流以及轨电位的分布规律及其影响因素,以便于提出减少杂散电流与轨电位危害的更为合理的方法。 With the long-term operation of the subway, the stray current seriously corrodes the rails and the pipelines near the rails. At the same time, the problem of personal electric shock caused by the abnormal increase of the rail potential has become increasingly prominent. In this paper, a discrete model of metro return system is established and simulated in MATLAB. The distribution rules of DC stray current and rail potential are obtained and their influencing factors are proposed so as to reduce the risk of stray current and rail potential A more reasonable method.